Expecting `index.js` to be resolved when `require` a directory

[vilicvane]

TypeScript Version:
nightly (1.9.0-dev.20160217)

[billti]

This is the same issue as #6670 , so I'll close this one as a duplicate.

Note: I have a pull request out for this currently. (#7075).

[vilicvane]

@billti Great to know, thanks!